PrEP efficacy the evidence
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1 PrEP efficacy the evidence Dr Michael Brady Consultant, HIV and Sexual Health King s College Hospital, London Medical Director Terrence Higgins Trust
2 PrEP Pre-exposure prophylaxis Tenofovir and emtricitabine (TDF/FTC) Branded (Truvada) Generic
3 Effectiveness in clinical trials: MSM and TGW South America, US, SA 2499: MSM (88%) and TGW (12%) Adherence 50% UK 544 MSM (1 TGW) Adherence 88% France 414 MSM Adherence 86% (Grant et al, NEJM, 2010) (McCormack et al, The Lancet, 2015) (Molina et al, NEJM, 2015)
4 Effectiveness in clinical trials Heterosexual South Africa, Uganda, Zimbabwe 5029 women, randomised to oral TDF, oral TDF/FTC, vaginal TFV gel, placebo Zero evidence effectiveness Adherence: 25-30% South Africa, Kenya, Tanzania 2120 women Randomised 1:1 to TDF/FTC or placebo No evidence effectiveness Adherence <40% (Marazzo et al. NEJM, 2015) (van Damme L et al. NEJM, 2012)
5 Effectiveness in clinical trials Heterosexual Botswana HT men and women (n=1219) Randomised to TDF/FTC or placebo Adherence: 84% (Karim et al. Lancet 2011) Kenya and Uganda Heterosexual men and women randomised to placebo (n=1586) or TDF (n=1589) or TDF/FTC (n=1583) Adherence: 92% (Baeten et al. NEJM 2012)
6 Effectiveness in clinical trials Trans women and PWID Subgroup analysis iprex trial 1 : 339 TGW 11 infections PrEP arm and 10 in placebo (HR: 1.1, 95% CI: ) None of those infected had detectable TDF/FTC in blood Reported higher rates of high HIV risk behaviours The Bangkok Tenofovir Study 2 : 1:1 male and female PWID randomised to TDF or placebo. 48.9% reduction incidence (95% CI ) Adherence 83% 1. Deutsch MB et al. HIV pre-exposure prophylaxis in transgender women: a subgroup analysis of the iprex trial. The Lancet HIV (2015) 2. Choopanya et al. Antiretroviral prophylaxis for HIV infection in injecting drug users in Bangkok, Thailand (the Bangkok Tenofovir Study). The Lancet (2013)
7 Effectiveness in open label extension studies - MSM iprex-ole 1 76% of 1603 iprex participants, MSM/TGW No seroconversions if drug levels compatible with four pills/week IPERGAY-OLE MSM 97% reduction in risk compared to the placebo arm of the IPERGAY randomised phase 1. Grant RM et al. Uptake of PrEP, sexual practices, and HIV incidence in men and transgender women who have sex with men. The Lancet Infectious Diseases (2014) 2. Molina et al. Efficacy of "On Demand" PrEP in the ANRS IPERGAY Open-Label Extension Study. IAS, Durban (2016)
8 Effectiveness in open label extension studies Heterosexual Partners PrEP OLE 1 89% of 1418 heterosexual men and women Efficacy of TDF (67%) & FTC/TDF (75%) TDF2 OLE men and women, 33% did not complete follow up No new HIV infections during the 12 month F/U 87% women and 96% men had detectable drug levels at visits 1. Ndase P et al. Successful discontinuation of the placebo arm and provision of an effective HIV prevention product: the partners PrEP study experience. JAIDS Chirwa LI et al. Enrollment into open-label phase of TDF2 PrEP Study. 20th IAC; 2014; Melbourne, Australia.
9 Differences in efficacy largely explained by adherence
10 Tissue : Blood Plasma Ratio Tissue concentrations: male versus females GENDER DIFFERENCE OR COMPARTMENT DIFFERENCE? Tenofovir Emtricitabine Different concentrations of membrane transporters explain a lot of the difference in genital tract tenofovir concentrations 0.1 Cervix/Vagina Male Rectum Different tissue drug concentrations = different dose-response in males versus females Need for: Different adherence patterns? Different drugs/drug combinations? Different dosing schedules? [1] Patterson et al et al. 2011; [2] Nichol MR et al. J Clin Pharmacol. 2014
11 PrEP - dosing Daily dosing For all 7 day lead in to protection On demand dosing For anal sex 2 tablets 2 24 hours before sex lead in to protection Ts and Ss: Tuesday, Thursday, Saturday, Sunday For anal sex
12 PrEP - safety Renal function Where renal function has been affected PrEP was associated with mild, non-progressive and reversible reductions in renal function Being aged >40 years or having impaired renal function at baseline are associated with a (small) risk of renal impairment. Bone mineral density Where bone mineral density was studied, small net decreases have been noted in those taking PrEP. There are no long-term data on bone health or evidence of increased fracture risk.
13 Bone safety: iprex Decline significantly steeper in first 24 weeks vs later time periods Mulligan K et al. Clin Infect Dis Aug 15; 61(4):
14 iprex BMD reversibility Placebo Low TDF levels High TDF levels On average, BMD returned to baseline levels by 1 year after PrEP stop. Recovery was consistent across age, baseline BMD z-score and treatment duration. Glidden DV et alj Acquir Immune Defic Syndr Jun 19. doi: /QAI
15 PrEP drug resistance Ensuring individuals are HIV negative when starting PrEP is essential HIV drug resistance uncommon in clinical trials but was seen in those starting PrEP with undiagnosed recently acquired HIV PROUD study: 3 of 6 individuals who were seroconverting at baseline (immediate group) or month 12 (deferred group) developed resistance to emtricitabine
16 PrEP identifying those at risk WHO: Offering PrEP should be a priority for populations with an HIV incidence of about 3 per 100 (3%) or higher HIV incidence (MSM): PROUD deferred arm: 9% incidence IPERGAY placebo arm: 7% incidence How do we identify other groups with similarly high HIV incidence?
17 HIV incidence in STI Clinic Attendees Estimated HIV incidence among sexual health clinic attendees in England (2012) Group of attendees Estimated incidence 95% CI All 0.15% 0.13% % MSM 1.34% 1.15% % Heterosexuals 0.03% 0.02% % Black African Heterosexuals 0.17% 0.08% % Ref: Sex Transm Infect 2015;91:A2 doi: /sextrans HIV incidence in HIV negative MSM who re-attended at STI clinics (2012) Category HIV incidence (per 100 py) 95% CI HIV test days prior to current attendance Bacterial STI in previous year and/or at current attendance Rectal bacterial STI in previous year and/or at current attendance PEP in previous year Ref: GUMCAD, PHE, HIV incidence analyses 2012
18 HIV risk assessment and PrEP - heterosexual Good evidence of PrEP efficacy if provided to those at high risk of HIV All trials in heterosexuals conducted in sub-saharan Africa HIV incidence in black Africans attending GUM clinics is 0.17% 1, compared to the 2 5% incidence seen in the RCTs Difficult to identify, using specific clinical criteria, heterosexual people in the UK who would be at sufficient risk Insufficiently precise clinical criteria or application of criteria may result in people unnecessarily taking PrEP 1 GUMCAD, PHE, HIV incidence analyses 2012
19 HIV risk assessment and PrEP - Trans people It is estimated that worldwide, trans women are 49 times more likely to be infected with HIV than the general population 1 unplanned subgroup analysis of trans women (iprex and iprex OLE) Very small numbers of trans women in phase 3 trials (PROUD and Ipergay) Effectiveness poorer than MSM adherence.. and yet high HIV risk There are no PrEP studies in trans women which are specifically designed for and focussed on trans women and trans issues, There is no data at all in trans men
20 Summary: PrEP efficacy and safety PrEP is highly effective and safe We have the best evidence for MSM The challenge for other groups at risk of HIV is: Awareness and knowledge Engagement Identifying those at risk There are dosing options for anal sex (daily vs on-demand) Daily dosing for other exposures Renal monitoring important but mostly for those already at risk of renal disease Effect on bone uncertain but no evidence of harm so far from studies
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